Statements of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash flows from operating activities:
Net loss	$ (7,980,596)		$ (6,511,617)
Adjustments to reconcile net loss:
Depreciation and amortization	696,800		496,733
Bad debt expense	700		40,000
Non-cash interest expense			14,101
Write-off of unamortized financing costs			41,166
Stock-based compensation	164,168		268,381
Change in fair value of warrant liability	(137,142)		(15,433)
Changes in operating assets and liabilities:
Accounts receivable	22,330		(29,447)
Inventory	(16,815)		238,642
Prepaid expenses and other current assets	414,558		89,173
Accounts payable and accrued expenses	(192,101)		(834,292)
Other current liabilities	(6,119)		19,785
Deferred rent	(10,009)		(5,913)
Deferred revenue	(76,661)		88,873
Long-term interest payable			7,417
Net cash used in operating activities	(7,120,887)		(6,092,431)
Cash flows from investing activities:
Purchases of property and equipment			(1,641,297)
Net cash used in investing activities			(1,641,297)
Cash flows from financing activities:
Net proceeds from private placements/public offerings	11,460,715		15,746,549
Net proceeds from long term debt			6,000,000
Expenses related to borrowings and issuance of warrant			(245,358)
Proceeds from exercise of stock options			18,059
Net cash provided by financing activities	11,460,715		21,519,250
Net increase in cash and cash equivalents	4,339,828		13,785,522
Cash and cash equivalents at beginning of period	3,782,881	[1]	7,861,524
Cash and cash equivalents at end of period	8,122,709		21,647,046
Supplemental Schedule of Noncash Investing and Financing Activities:
Amortization of deferred financing costs			$ 41,166

[1] Derived from the audited balance sheet as of December 31, 2013